load.c

load.c

bool load(FILE* file, BYTE** content, size_t* length)
{
    // check if file is null
    
    // initialize length and content
    *length = 0;
    *content = NULL;
    
    if (file == NULL)
    {
        // if it is we've got an error
        return false;
    }
    
    // initialize the buffer
    BYTE buffer[512];
    
    // iterate over the contents of the file
    // read 512 chunks of 1 byte at a time
    // read while it can (not 0)
    // the update will be to read again and store in buffer
    for(int c = fread(buffer, 1, 512, file); c != 0; c = fread(buffer, 1, 512, file))
    {
        // first iteration it will allocate memory
        // other iterations will reallocate mem, the new size will be:
        // old size + new bytes + 1
        *content = realloc(*content, *length + c + 1);
        
        // check for errors allo/reallocating memory
        if (content == NULL)
        {
            return false;
        }
        
        // copy the buffer into content
        // destination is the first byte + old bytes
        // from buffer
        // new bytes c
        memcpy(*content + *length, buffer, c);
        *length = *length + c;
    }
    return true;
}